aws-sdk-client-mock
fast-check
aws-sdk-client-mock | fast-check | |
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2 | 21 | |
724 | 4,131 | |
- | - | |
7.5 | 9.8 | |
13 days ago | 3 days ago | |
TypeScript | TypeScript | |
MIT License | MIT License |
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aws-sdk-client-mock
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Top 12 Serverless Announcements from re:Invent 2022
If you are using the AWS JS SDK v3, the best way to mock it for unit tests is to use the aws-sdk-client-mock library.
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Jest Testing like a Pro - Tips and tricks
This does not mean we never used aws-sdk-mock - haven't tried yet this version for SDK v3 - check this article for more info - but in general I try to write very simple unit tests, and very simple integration tests, keeping mocks to a minimum.
fast-check
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The 5 principles of Unit Testing
Libraries like JSVerify or Fast-Check offer essential tools to facilitate property-based testing.
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How to Survive Your Project's First 100k Lines
Strong agree!
For JavaScript, I suggest folks check out fast-check [0] and this introduction to property-based testing that uses fast-check [1].
This is broadly useful, but one specific place I've found it helpful was to check redux reducers against generated lists of actions to find unchecked edge cases and data assumptions.
[0] https://github.com/dubzzz/fast-check
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Master property-based testing in JavaScript: A step-by-step tutorial
Brilliant, this is a massive improvement. Previously I was fumbling around in https://github.com/dubzzz/fast-check/tree/main/packages/fast-check/documentation for info.
- Bring the power of property based testing framework fast-check into Vitest
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[AskJS] Should I be generating random data for parameters when unit testing?
There's a library for exactly that: FastCheck.
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Integrate Jest and fast-check together
It makes @fast-check/jest, the best option to integrate Jest and fast-check, as it provides an abstraction over both to ease their mutual integration.
- I Created an API to Generate Mock Information
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Generating dummy entities with random data for tests based on types
The closest that I know of (and I have not used this) is zod-fast-check. It generates fast-check โarbitrariesโ (test data generators) for property-based testing based on zod schemas. Of course, this requires that you use zod to define your types, which has some downsides. Fortunately there is another tool, ts-to-zod, (which I also have not used) which will codegen zod schemas based on TS type definitions. If you thread these four libraries together you should end up with the ability to write random tests on generated data with very little overhead. In theory.
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Best practice where to test validation?
For something like this, I might break out fast-check for testing. Itโs good at generating a wide range of values for a given type, and could help you get good test coverage without having to hand-author a lot of repetitive error inputs.
- Fast-check: How it works
What are some alternatives?
aws-sdk-mock - :rainbow: AWSomocks for Javascript/Node.js aws-sdk tested, documented & maintained. Contributions welcome!
Unexpected - Unexpected - the extensible BDD assertion toolkit
mocha - โ๏ธ simple, flexible, fun javascript test framework for node.js & the browser
jest - Delightful JavaScript Testing.
mongodb-memory-server - Spinning up mongod in memory for fast tests. If you run tests in parallel this lib helps to spin up dedicated mongodb servers for every test file in MacOS, *nix, Windows or CI environments (in most cases with zero-config).
tape - tap-producing test harness for node and browsers
ava - Node.js test runner that lets you develop with confidence ๐
trevor - ๐ฆ Your own mini Travis CI to run tests locally
fluentfixture - A flexible tool for generating customizable mock data with a fluent interface ๐
test-each - ๐ค Repeat tests. Repeat tests. Repeat tests.
org-formation-cli - Better than landingzones!
nyc - the Istanbul command line interface